Machine and method for constructing concrete pipe



Nov. 25, 1930. A. w. scHULTz MACHINE AND METHOD FOR CONSTRUOTING CONCRETE PIPE.

File@ July 2. 1928 .Ar 7.5.2... A.

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Guan/wmf Patented Nov. 25,` 1930 `UNITEI') skrryrrfzs PATENT OFFICE I N 1 ALFRED, w. sCHUIJTz, or wATnRinoo7 IowA, AssIGNoR To THEZEIDLER CONCRETE `I'noDUCTs MACHINERY` CoMrANY,

OF WATERLOO, IOWA.'

y MACHINE AND METHOD Foi-:(CoNsTRuoTIN-'r `CoNomaTa PIPE Application filed July 2, 1928. Serial No. 289,682.`

My invention relates to improvements in machines and methods for constructing con-` crete pipetile or` conduits, `with or without reinforcing, and the object of my improvement is to supply a `method and an apparatus for cooperating with such a machine to produce in the terminations, bell-ends or other formed ends, `of concrete pipe tile or conduit sections a stronger and more consolidated constructiony and so cohesive as to render such terminal parts proof` against any stresses thereagainst or accidentalruptures and especially at reentrant angles thereof where most exposed to breakage in handling, storin`g,\shipping or while being placed in position with others in a trench or otherplace.

\ This object I have accomplished by the method and by the mechanism which are hereinafter described and claimed, and which are illustrated in the accompanying drawings, in which Fig. 1 is a vertical central or axial section of the conjoint means for forming a section' of concrete pipeincluding my device for jarring and consolidating the plastic contents of a bell-end or other shaped termination of the section according to the prin- "ciple of my invention, parts of the mecha- 1,248,018, for tile nismbeing broken away. of the cam-carrier device Myinventionin both its method and mechanism is not restricted to the precise process nor to the exact construction and arrangement of parts of the mechanism by which Fig. 2 is a top plan of th-e invention.

the method is effected and herein shown and described, nor to the various details'thereof,

as both may be modiiied, varied or rearranged in various ways and particulars without departing from the spirit andscope of my invention, one practical method of which has been herein describedand exemplified specilically without attempting to show all of the various modes andformsandmodifications in which the invention might be shown.V

I have herein added improvementsl upon the patent to Schenk and Stewart, No. machine, the property of the assignee of this application.

i My invention includesy a relatively fixed table 1 havingan aperture 2. A spider 3 has `dlvergent armsbent'upwardly and secured for the formation therein section of `concrete body with stems projecting ther by screws 4 to the lowerface of the table,

A rigid axial stud or pin projectsupwardly at 12V from the-center of a cam-carrier disk lO having a short depending cylindrical shaftor boss 9 seated rotatably in a shallow upwardly opening step-bearing 8 at the'center of said spider 3. The upperend part of the pin 12m-transversely apertured i to seat therethrough across-pin 143.l

The numeral 7 denotes a substantially cylindrical hollow mold-casing whose,` lower .I

part isexpanded at 6 in a! well-known way of abell-end oa nations being aperturedto" seat removably on said screw stems 4, with the mold-casing "concentric with and above the'disk l()y and its central pin 12.

`The numeral ltdenotes a pallet mounted removably on lugs on the'supports 5 and having its 'central partraised upwardly annui larly with a central circular aperture concentric withthe axis of the mold-casing.`

The numeral 19 denotes a hollow former- `head with cylindrical outer walland of a diameter slightly less than the diameter of the central aperture of the pallet 14, the

1 former-head having a closed top and open bottom Vand having a central interiorily threaded opening to seat the diminshed exteriorly threaded lower end 22 ofpan axial shaft partl which is expandedat its upper end 24 and cupped to mate with a diminished termination of the rotatable shaft `23, the latter i being rotated by any suitable mechanism which includes means for simultanenously pipe ifwhose cylindrical reciprocating it `and'said former-head 19 l through theV mold-casing. 7. A pair of like troweling bodies 25 `are'mou'nted upon the shaft lower 1 section immediately above the former-headll). Both 'the former-head and said troweling bodies serve while they are being simultaneously rotated and reciprocated in and through said mold-casing 7 to shape and trowel accurately the longitudinally hollowed tile being formed within the casing from Ydeposited plastic materials.

The threaded termination 22 of the shaft projects downwardly below the closed upper end of the former-head 19 to seat thereon a socketed'capor eiitension 20 whose lower end is socketed at 26 toibe seated cent-rally upon the raised pin 12, and also transversely grooved at 21 to seat over and engage the end parts of the cross-pin 18. By this means, the disk 1() may be rotated while said parts are coengaged as the former-head is at its lowermost position and has a momentary cessation of reciprocat-ion due to cam-mechanism not shown but such as is well-known in this art. Y

A flat ring 15 is removably secured by screws tothe supports spaced vertically `below the pallet 14 concentrically and is apertured at 16 in a number of places concentrically to loosely seat headed pins or tappets 17 whose heads are immediately below the annular bottom outer part of the pallet. The disk `has radial ribs 11 upon its upper surface which are triangular in cross-section and which serve as cams into whose path of rotation the lower rounded terminations of the stems of the tappets 17 extend, so that when the disk 10 `is in rapid rotation the tappets in succession ride upwardly upon these ribs 11 and rap their heads upon the lower annular rim part of the pallet 14 thereabove, thus imparting to the pallet all around a succession of arring blows for va purpose to be described. To prevent any sticking of the tappets, a coiled light compression spring 18 may be mounted around the lower projecting part of each engaged between the ring and a pin inserted in an aperture in the end of the tappet.

Concrete material in a plastic aqueous miX- ture of relatively coarse sand, with or without small particles `of rock, and finely comminuted cement, having been deposited by means not Ashown intially within the moldcasing 7 and during the operation of forming a tile section therein, is delivered into the interspace of the pallet 14 and the bell-end 6 of the mold-casing immediately before and during the troweling action of the troweling bodies when moving upwardly and rotating. By this means the t-ile is ordinarily formed of homogeneous consistency. 1t has been found that the bell-end of the tile is peculiarly susceptible to breakage particularly at its angles by handling and positionin assemblage with others.

have discovered that the bell-ends of lsuch tile, or in fact any tile `tpermination,'may be differentially stipengthened ,and fortified against such .stresses and shocks as are met in practice, by constructing these terminations of a richer mixture of the cementitious elements of the plastic concrete used for the tile. This differential construction may be effected by different methods and by means of different mechanisms, of which the one illustrated is typical.

v VA differential settling of the concrete mixture in the bell-end part only of the moldcasing 7 is effected by intermittent jarring of either the bell-end 6 of the mold-casing or of the outer annular part of the pallet 14. T he rapid light and repeated jarring of either causes a partial separation of the ingredients of the mixture because of their fiowable condition Vin the loosely plastic mass, so that the finely comminuted particles tend toseekthe bottom of the bell-end of the forming tile structure in passing through the interstices of the larger particles vof sand or rocky substances, and as these finer particles are cementitious and more closely consolidated as thus differentially separated and settled, the bellend at the bottom and more Gradually mixed upwardly is, when dried out, more solid than the general and homogeneous substance of the body of the tile thereabove and harder and more resistant at the inner reentrant angles. This differential settling is shown in Fig. 1 at the bottom part of the moldcasing between it and the pallet 14 -by the more closely compacted dot-s indicating this resistant and separately settled cementitious ingredient `which gradually merges with the coarser ingredients above.

rllhe bell-end of a tile section thus constructed is not only much stronger to resist shocks, but less impervious than other parts of the tile, vand also smoother exterior-ly which insu-res better fitting of the assembled tiles in alinement. The method is operative Without any change in the tile-forming mechanisms, and without delay in the manufacture, as the action of the jarring device is entirely automatic.

Having described my invention, what I claim as new, and desire to secure vby Letters Patent, is:

1. The method of differentially consolidating a termination of a concrete pipe section, which consists in subjecting the mixed concrete in the end `part of a molding device to light intermittent jarring before troweling the tile body thereabove.

2. The method of-dit'ferentially consolidating and settling mixed-concrete materials in plastic condition in a bell end part of afmolding device, by subjecting the latter to rapid intermittent jarring while the materials are being delivered into sai dend part and before the troweling of the body of the tile thereabove.

3. The combination with a molding device, of cooperating mechanisms operative to rapidly intermittently jar the contents .of a

lower portion to t having a lower part of said device before the troweling of another part to cause differential settling in the lower part of the device of finer from coarser ingredients of a plastic mixture de-V posited in the device.

4. The combinationwith a molding device termination of a hollow tile to be molded therein, of means for rapidly tapping said differentially settle the mixed plastic ingredients of a mixture deposited in the device to produce a termination on the formed tile of harder and stronger consistency than the body of the tile.

5. The combination with a mold toshape a concrete body from a mixture of Howable ner and coarser ingredients, of mechanisms associated with said mold comprising a plurality. of tappets mounted movably in a desired arrangement relatively to an end partA of the mold, means for causing said tappets to strike said end part in repeated succession, and a rotary troweling device to simultaneously trowel said mixture in said end part immediately after said tapping operation.

6. The combination with a mold to shape a concrete body from a mixture of liowable finer and coarser ingredients, of a mechanism associated with said mold comprising a plurality of tappets movable to and from an end part of the mold to tap the'same in Y and a rotary cam` moving in one direction7 device adapted 4to impinge upon said tappets in succession to cause them to intermittently 'p jar the said end part of the mold to cause differential settling of the concrete materials in said end part.

7. The combination with a mold to shape a concrete body from a mixture of flowable liner and coarser ingredients, of a mechanism associated with said mold comprising av plurality of tappets movablel to and from an end part of the mold to tap the same in moving in one direction, means for resiliently con'- trolling said tappets, and a rotary cam device adapted to impinge upon said tappets in succession to cause them to jar said end part of the mold and cause a dil'erential'settling. of the components of the concrete mixture to settle thener ingredients below the coarser ingredients thereof in said end part.

In testimony whereof I aiiix my signature.

ALFRED W. SCHULTZ.

portion adapted to shape a` 

